defmt global logger with rtt-target

[Gibbz]

I want to setup a global logger so I can intercept the log messages for an extra output over bluetooth. But I dont know how to point my functions to the rtt-target functions....
https://defmt.ferrous-systems.com/global-logger

pub fn set_defmt_channel(channel: UpChannel) {
   rtt_target::set_defmt_channel(...) // this on is possible
}

unsafe impl defmt::Logger for Logger {
    fn acquire() {
        rtt_target::defmt::acquire() // not accessible
    }
    unsafe fn flush() {
         rtt_target::defmt::flush() // not accessible
    }
    unsafe fn release() {
         rtt_target::defmt::release() // not accessible
    }
    unsafe fn write(bytes: &[u8]) {
         rtt_target::defmt::write(...) // not accessible
    }
}

[bugadani]

To do something like this, you'll need to keep the "defmt" feature disabled, copy the contents of defmt.rs and modify that for your needs. The "defmt" feature automatically registers a global logger, so you can't make another beside it.